package com.hadoop.wordcount;

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;

import java.io.IOException;

/**
 * Created by yu756 on 2020/1/18 9:57
 */
public class WordCountMapper extends Mapper<LongWritable, Text, Text, IntWritable> {

    Text k = new Text();
    IntWritable v = new IntWritable(1);

    @Override
    protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
        //1 获取一行
        String line = value.toString();
        // 2 切割
        String[] split = line.split(" ");
        // 循环写出
        for (String word : split) {
            k.set(word);
            context.write(k, v);
        }

    }
}
